A method of using strong carbon-secreting modified biochar to strengthen nitrogen removal in constructed wetlands

Abstract

The invention relates to a method for reinforcing denitrification in a constructed wetland with strong carbon secretion type modified biological carbon. The constructed wetland is reinforced for denitrification by taking the strong carbon secretion type modified biological carbon as a treating agent, the strong carbon secretion type modified biological carbon and a substrate are mixed and filled in a bed body of the constructed wetland or are directly embedded into the bed body of the constructed wetland as filler columns, and the strong carbon secretion type modified biological carbon is obtained by low temperature carbonization and ferrous loading by taking wetland plants as raw materials; the temperature of denitrification is 0-40 DEG C, the pH value is 6-8, and the total nitrogen content of sewage of the constructed wetland is 5-60 mg / L. According to the method, the denitrification in the constructed wetland is reinforced by utilizing the strong carbon secretion type modified biological carbon, so as to obtain an unexpected effect; when in application, Fe(II) is loaded simple and conveniently, Fe(II) can serve as an electron donor for transferring electrons to high-valence nitrogen (such as NO3<-> and NO2<->), and the high-valence nitrogen is reduced into nitrogen while the high-valence nitrogen is oxidized. Therefore, the chemical denitrification process is realized, and efficient denitrification is achieved.

Description

technical field [0001] The invention relates to a method for denitrification of constructed wetlands, in particular to a method of using strong carbon-secreting modified biochar to strengthen the chemical and microbial denitrification of constructed wetlands, belonging to the technical field of environmental engineering sewage treatment Background technique [0002] Constructed wetland, as a unique composite ecological sewage treatment technology composed of plants, substrates, microorganisms, etc., has outstanding application advantages in the advanced treatment of tail water of sewage treatment plants in developing areas, and has gradually become a common method for deep purification of sewage. One of the emerging methods. However, due to the low carbon-to-nitrogen ratio and high nitrate nitrogen content in the tail water that meets the standards, the denitrification and denitrification effect of constructed wetlands is often inhibited. In addition, the area of ​​wetland ...

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Problems solved by technology

[0005] Chinese patent document CN 104761057A discloses a biochar modular composite vertical flow constructed wetland system, which adds biochar to the concept of vertical flow constructed wetland, but the patent does not specifically propose the preparation method of biochar and the release of biochar carbon source Characteristics and Microorganisms—Biochar Nitrogen Removal Mechanism

At present, biochar is mostly used as an adsorbent or soil improver, and there are few reports on the application of denitrification to strengthen denitrification, and most of the current biochar is prepared at high temperature, most of the organic matter is gasified, and the ability to provide carbon sources is extremely limited.

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